keyword
MENU ▼
Read by QxMD icon Read
search

Stretching

keyword
https://www.readbyqxmd.com/read/29332130/cerebrospinal-fluid-pressure-revisiting-factors-influencing-optic-nerve-head-biomechanics
#1
Yi Hua, Andrew P Voorhees, Ian A Sigal
Purpose: To model the sensitivity of the optic nerve head (ONH) biomechanical environment to acute variations in IOP, cerebrospinal fluid pressure (CSFP), and central retinal artery blood pressure (BP). Methods: We extended a previously published numerical model of the ONH to include 24 factors representing tissue anatomy and mechanical properties, all three pressures, and constraints on the optic nerve (CON). A total of 8340 models were studied to predict factor influences on 98 responses in a two-step process: a fractional factorial screening analysis to identify the 16 most influential factors, followed by a response surface methodology to predict factor effects in detail...
January 1, 2018: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/29331427/water-soluble-mercury-ion-sensing-based-on-the-thymine-hg2-thymine-base-pair-using-retroreflective-janus-particle-as-an-optical-signaling-probe
#2
Hyeong Jin Chun, Saemi Kim, Yong Duk Han, Dong Woo Kim, Ka Ram Kim, Hyo-Sop Kim, Jae-Ho Kim, Hyun C Yoon
Herein, we report an optical sensing platform for mercury ions (Hg2+) in water based on the integration of Hg2+-mediated thymine-thymine (T-T) stabilization, a biotinylated stem-loop DNA probe, and a streptavidin-modified retroreflective Janus particle (SA-RJP). Two oligonucleotide probes, including a stem-loop DNA probe and an assistant DNA probe, were utilized. In the absence of Hg2+, the assistant DNA probe does not hybridize with the stem-loop probe due to their T-T mismatch, so the surface-immobilized stem-loop DNA probe remains a closed hairpin structure...
January 6, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29331362/multi-model-analysis-of-diffusion-weighted-imaging-of-normal-testes-at-3-0-t-preliminary-findings
#3
Xiangde Min, Zhaoyan Feng, Liang Wang, Jie Cai, Basen Li, Zan Ke, Peipei Zhang, Huijuan You, Xu Yan
RATIONALE AND OBJECTIVES: This study aimed to establish diffusion quantitative parameters (apparent diffusion coefficient [ADC], DDC, α, Dapp, and Kapp) in normal testes at 3.0 T. MATERIALS AND METHODS: Sixty-four healthy volunteers in two age groups (A: 10-39 years; B: ≥ 40 years) underwent diffusion-weighted imaging scanning at 3.0 T. ADC1000, ADC2000, ADC3000, DDC, α, Dapp, and Kapp were calculated using the mono-exponential, stretched-exponential, and kurtosis models...
January 10, 2018: Academic Radiology
https://www.readbyqxmd.com/read/29331141/effects-of-cross-linking-on-partitioning-of-nanoparticles-into-a-polymer-brush-coarse-grained-simulations-test-simple-approximate-theories
#4
Masoumeh Ozmaian, David Jasnow, Afshin Eskandari Nasrabad, Anton Zilman, Rob D Coalson
The effect of cohesive contacts or, equivalently, dynamical cross-linking on the equilibrium morphology of a polymer brush infiltrated by nanoparticles that are attracted to the polymer strands is studied for plane-grafted brushes using coarse-grained molecular dynamics and approximate statistical mechanical models. In particular, the Alexander-de Gennes (AdG) and Strong Stretching Theory (SST) mean-field theory (MFT) models are considered. It is found that for values of the MFT cross-link strength interaction parameter beyond a certain threshold, both AdG and SST models predict that the polymer brush will be in a compact state of nearly uniform density packed next to the grafting surface over a wide range of solution phase nanoparticle concentrations...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29331138/role-of-non-equilibrium-conformations-on-driven-polymer-translocation
#5
H H Katkar, M Muthukumar
One of the major theoretical methods in understanding polymer translocation through a nanopore is the Fokker-Planck formalism based on the assumption of quasi-equilibrium of polymer conformations. The criterion for applicability of the quasi-equilibrium approximation for polymer translocation is that the average translocation time per Kuhn segment, ⟨τ⟩/NK, is longer than the relaxation time τ0 of the polymer. Toward an understanding of conditions that would satisfy this criterion, we have performed coarse-grained three dimensional Langevin dynamics and multi-particle collision dynamics simulations...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29331130/femtosecond-coherent-nuclear-dynamics-of-excited-tetraphenylethylene-ultrafast-transient-absorption-and-ultrafast-raman-loss-spectroscopic-studies
#6
Surajit Kayal, Khokan Roy, Siva Umapathy
Ultrafast torsional dynamics plays an important role in the photoinduced excited state dynamics. Tetraphenylethylene (TPE), a model system for the molecular motor, executes interesting torsional dynamics upon photoexcitation. The photoreaction of TPE involves ultrafast internal conversion via a nearly planar intermediate state (relaxed state) that further leads to a twisted zwitterionic state. Here, we report the photoinduced structural dynamics of excited TPE during the course of photoisomerization in the condensed phase by ultrafast Raman loss (URLS) and femtosecond transient absorption (TA) spectroscopy...
January 14, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29330952/jaw-muscle-fiber-architecture-and-leverage-in-the-hard-object-feeding-sooty-mangabey-are-not-structured-to-facilitate-relatively-large-bite-forces-compared-to-other-papionins
#7
Andrea B Taylor, Claire E Terhune, Maxx Toler, Megan Holmes, Callum F Ross, Christopher J Vinyard
Numerous studies have sought to link craniofacial morphology with behavioral ecology in primates. Extant hard-object feeders have been of particular interest because of their potential to inform our understanding about the diets of early fossil hominins. Sooty mangabeys (Cercocebus atys) are hard-object feeders that frequently generate what have been described as audibly powerful bites at wide jaw gapes to process materially stiff and hard seeds. We address the hypothesis that sooty mangabeys have features of the masticatory apparatus that facilitate this feeding behavior by comparing fiber architecture and leverage of the masseter and temporalis muscles between sooty mangabeys and three papionin primates that do not specialize on hard objects...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29330947/dietary-correlates-of-primate-masticatory-muscle-fiber-architecture
#8
Adam Hartstone-Rose, Ashley R Deutsch, Carissa L Leischner, Francisco Pastor
Analyses of masticatory muscle architecture-specifically fascicle length (FL; a correlate of muscle stretch and contraction speed) and physiological cross-sectional area (PCSA; a correlate of force)-reveal soft-tissue dietary adaptations. For instance, consumers of large, soft foods are expected to have relatively long FL, while consumers of obdurate foods are expected to have relatively high PCSA. Unfortunately, only a few studies have analyzed these variables across large primate samples-an order of particular interest because it is our own...
February 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29330438/improved-resolution-optical-time-stretch-imaging-based-on-high-efficiency-in-fiber-diffraction
#9
Guoqing Wang, Zhijun Yan, Lei Yang, Lin Zhang, Chao Wang
Most overlooked challenges in ultrafast optical time stretch imaging (OTSI) are sacrificed spatial resolution and higher optical loss. These challenges are originated from optical diffraction devices used in OTSI, which encode image into spectra of ultrashort optical pulses. Conventional free-space diffraction gratings, as widely used in existing OTSI systems, suffer from several inherent drawbacks: limited diffraction efficiency in a non-Littrow configuration due to inherent zeroth-order reflection, high coupling loss between free-space gratings and optical fibers, bulky footprint, and more importantly, sacrificed imaging resolution due to non-full-aperture illumination for individual wavelengths...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29329816/structural-polymorphism-of-a-cytosine-rich-dna-sequence-forming-i-motif-structure-exploring-ph-based-biosensors
#10
Saami Ahmed, Mahima Kaushik, Swati Chaudhary, Shrikant Kukreti
Sequence recognition and conformational polymorphism enable DNA to emerge out as a substantial tool in fabricating the devices within nano-dimensions. These DNA associated nano devices work on the principle of conformational switches, which can be facilitated by many factors like sequence of DNA/RNA strand, change in pH or temperature, enzyme or ligand interactions etc. Thus, controlling these DNA conformational changes to acquire the desired function is significant for evolving DNA hybridization biosensor, used in genetic screening and molecular diagnosis...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29329275/chitosan-starch-films-with-natural-extracts-physical-chemical-morphological-and-thermal-properties
#11
Jessica I Lozano-Navarro, Nancy P Díaz-Zavala, Carlos Velasco-Santos, José A Melo-Banda, Ulises Páramo-García, Francisco Paraguay-Delgado, Ricardo García-Alamilla, Ana L Martínez-Hernández, Samuel Zapién-Castillo
The aim of this study is to analyze the properties of a series of polysaccharide composite films, such as apparent density, color, the presence of functional groups, morphology, and thermal stability, as well as the correlation between them and their antimicrobial and optical properties. Natural antioxidants such as anthocyanins (from cranberry; blueberry and pomegranate); betalains (from beetroot and pitaya); resveratrol (from grape); and thymol and carvacrol (from oregano) were added to the films. Few changes in the position and intensity of the FTIR spectra bands were observed despite the low content of extract added to the films...
January 12, 2018: Materials
https://www.readbyqxmd.com/read/29329117/ce-original-research-physical-activity-among-chinese-american-immigrants-with-prediabetes-or-type-2-diabetes
#12
Sophia H Hu, Mei R Fu, Shan Liu, Yen-Kuang Lin, Wen-Yin Chang
Findings from this mixed-methods study reveal deficits and suggest areas for change. ABSTRACT: Background: Although the benefits of aerobic exercise and strength training for patients with type 2 diabetes have been studied extensively, research on physical activity among Chinese American immigrants diagnosed with prediabetes or type 2 diabetes has been limited. PURPOSE: We sought to learn more about this population's knowledge of physical activity, the types and intensity levels performed, and the barriers to such activity...
January 11, 2018: American Journal of Nursing
https://www.readbyqxmd.com/read/29328668/bis-dinitrogen-cobalt-i-complexes-with-nhc-ligation-synthesis-characterization-and-their-dinitrogen-functionalization-reactions-affording-side-on-bound-diazene-complexes
#13
Yafei Gao, Guangyu Li, Liang Deng
Late transition-metal-based catalysts are widely used in N2 fixation reactions, but the reactivity of late transition-metal N2 complexes, besides of iron N2 complexes, remained poorly understood as their N2 complexes were thought labile and hard to be functionalized. By employing a monodentate N-heterocyclic carbene (NHC), 1,3-dicyclohexyl-imidazol-2-ylidene (ICy) as ligand, the cobalt(0)- and cobalt(-1)-N2 complexes, [(ICy)3Co(N2)] (1) and [(ICy)2Co(N2)2M]n (M = K, 2a; Rb, 2b; Cs, 2c), respectively, were synthesized from the stepwise reduction of (ICy)3CoCl by the corresponding alkaline metals under a N2 atmosphere...
January 12, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29328205/flexible-pulse-stretching-for-a-swept-source-at-2-0%C3%A2-%C3%A2-%C3%AE-m-using-free-space-angular-chirp-enhanced-delay
#14
Sisi Tan, Xiaoming Wei, Jianglai Wu, Lingxiao Yang, Kevin K Tsia, Kenneth K Y Wong
Dispersive pulse-stretching at 2.0 μm has long been hindered by the high intrinsic optical loss from conventional dispersive media. Here a flexible pulse-stretching technique at 2.0 μm is demonstrated over a broad bandwidth with large-scale dispersion and low intrinsic optical loss. The technique employs the newly proposed pulse-stretching scheme, namely, free-space angular-chirp-enhanced delay. Both normal and anomalous temporal dispersion (up to ±500  ps/nm) with low intrinsic loss (<6  dB) over a spectral bandwidth of ∼84  nm at 2...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328191/dispersion-managed-ho-doped-fiber-laser-mode-locked-with-a-graphene-saturable-absorber
#15
Maria Pawliszewska, Tadeusz Martynkien, Aleksandra Przewłoka, Jarosław Sotor
In this Letter, we demonstrate an all-fiber holmium-doped laser operating in the stretched-pulse regime. As a result of dispersion management, the laser is capable of generating 190 fs pulses with a bandwidth of 53.6 nm. The pulses centered at 2060 nm reach 2.55 nJ of energy. Mode-locking is achieved with a multilayer graphene saturable absorber (SA). The Letter also presents the measurement of group velocity dispersion of active (Nufern SM-HDF-10/130), passive (SMF28), and dispersion-compensating (Nufern UHNA4) fibers in a 1...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328175/dependence-of-the-birefringence-of-polystyrene-film-on-the-stretching-conditions
#16
Hee Jung Ryu, Jiyong Hwang, Jongyoon Kim, Ji-Hoon Lee
We investigated the dependence of the birefringence of polystyrene (PS) film with a negative optical birefringence on the stretching conditions. We varied the stretching ratio (SR), stretching speed (SS), and stretching temperature (ST), and measured the inplane birefringence and the Nz coefficient of the PS film. The inplane birefringence was increased with greater SR and SS but decreased with greater ST. The Nz coefficient of the stretched PS film was around zero and showed similar dependence on the stretching conditions like inplane birefringence...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29327828/the-acute-effects-of-stretching-with-vibration-on-dynamic-flexibility-in-young-female-gymnasts
#17
Aaron W Johnson, Caisa N Warcup, Matthew K Seeley, Dennis Eggett, Jeffery B Feland
BACKGROUND: While stretching with vibration has been shown to improve static flexibility; the effect of stretching with vibration on dynamic flexibility is not well known. The purpose of this study was to examine the effectiveness of stretching with vibration on acute dynamic flexibility and jump height in novice and advanced competitive female gymnasts during a split jump. METHODS: Female gymnast (n=27, age: 11.5 ± 1.7 years, Junior Olympic levels 5-10) participated in this cross-over study...
January 10, 2018: Journal of Sports Medicine and Physical Fitness
https://www.readbyqxmd.com/read/29327609/cross-bridge-mechanism-of-residual-force-enhancement-after-stretching-in-a-skeletal-muscle
#18
Youjiro Tamura
A muscle model that uses a modified Langevin equation with actomyosin potentials was used to describe the residual force enhancement after active stretching. Considering that the new model uses cross-bridge theory to describe the residual force enhancement, it is different from other models that use passive stretching elements. Residual force enhancement was simulated using a half sarcomere comprising 100 myosin molecules. In this paper, impulse is defined as the integral of an excess force from the steady isometric force over the time interval for which a stretch is applied...
January 12, 2018: Computer Methods in Biomechanics and Biomedical Engineering
https://www.readbyqxmd.com/read/29327551/-analysis-of-the-axial-stretching-force-of-the-small-splint-fixation-system
#19
Hong-Gang Zhong, Wei-Hua Liu, Fu-Hui Dong
OBJECTIVE: To measure the axial stretching force produced by the small splint fixation system in the treatment of the fracture. METHODS: Dumbbell shaped plexiglass was machined to model the bone shaft with expanded two ends. Force transducer was set at the model fracture site to measure the stretching force produced by fracture fixation of the small splint with cloth aqueous bag that simulated the muscles and other soft tissue underneath. RESULTS: There was positive relationship between the axial stretching force produced at the model fracture site and the transverse pressing force exerted by the external plates...
January 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29327361/myocardial-injury-in-fetal-aortic-stenosis-insights-from-amniotic-fluid-analysis
#20
Kevin G Friedman, Lynn A Sleeper, Raina N Fichorova, Taylor Weilnau, Wayne Tworetzky, Louise E Wilkins-Haug
OBJECTIVE: Fetal aortic stenosis (AS) imposes pressure load on the developing left ventricle (LV) and leads to derangements in myocardial structure and function via mechanisms that are not well characterized. METHODS: We compared amniotic fluid NT-BNP and troponin levels in fetuses with AS prior to fetal valvuloplasty and controls. We estimated correlations between NT-BNP and fetal echo parameters and identify NT-BNP cutoff associated with biventricular outcome RESULTS: Median NT-BNP level was higher in fetal AS than controls (3858 vs 1737 pg/ml, p<0...
January 11, 2018: Prenatal Diagnosis
keyword
keyword
28319
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"